Q135. A 100 W heater is used to heat 500 g of water from 20˚C to 50˚C. How long should the heater be switched on? (The specific heat capacity of water is 4.2 J/gC). Physics — NUST Mock 4 — Question 135 of 200A. 63 secondsB. 63 minutesC. 630 secondsD. 6.3 minutes.Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →